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(No Model.) 3 Sheets-Sheet l.

M. MAODERMOTT 8v W. GLOVER. BOCKDRILLING MACHINE. No. 320,371.

Patented June 16, 1885.

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(No Model.) 3 sheets-sheen 2. 1V1. MACDERMOTT 8v W. GLOVER.

ROCK DRILLING MACHINE.

Patented June 16, 1885.

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@7W 20% @LW N. PETERS. PhulwLikhognpher. Walhlnstun, D. C.

(No Moae.) l 3 sheets-sheen 3. M. MAGDERMOTT 8v W. GLOVER.

ROCK DRILLING MACHINE.

No. 320,371. Patented June 16, 1885.

UNTTen STATES PATENT @Triez-O MARTIN MAGDERMOTT AND YILLIAM GLOVE t, 0F LONDON, FNGLAND.

ROCK-DRILLHNG MACHINE.

SPECIFICATION forming part of Letters Patent No. 320,371, dated June 16,1885.

Application filed March 15, 1884.

(Xe model.) Patentrd in England September 17. 1881, No. 4,008, and July 5, 1883, No. 3,334;

in Germany January S), 1884, No. 28,197, and in Austria-Hungary December-16, 1881, NoA 39,594 and NoV 59,188.

To @ZZ whom t may concern.'

Beit known that we,MARr1N Macnnmro'rr and WILLIAM GLovER, subjects ofthe Queen g ot' Great Britain, and residing at London, England, have invented new and useful Improvementsin Itock-lerforating Machines,(tor which we have obtained patents in Great Britain,

No. 4,008, da-ted 17th September, 1881, and No. 3,334, dated 5th July, 1883, in Germany by Patent No. 28,197, dated January 9, 1884, and in AustriaHungary by Patent No. 39,591

and No. 59,188, dated 16th December, 1-8l,)

- upon it.

rating machine constructed in accordance with the invention.

Figure l, Sheet l, is a side elevation. Fig. 2, Sheet l, is a front elevation, partly in section. Figs. 3 and 4, Sheet 2, represent a front and side view, respectively, ot' the nut-box and its t of the arrow shown at the lower part oiFig. 4,

attachments on an enlarged scale. Fi g. 5 represents a partial horizontal section ot' the same.

Fig. 6 is a side elevation, on a larger scale, of

a modified arrangement for effecting the rotation ofthe drill-bar. Fig. 7 isa front elevation ofthe same, and Figs. 8 and 9 details, showing a front View and an edge view, respectively, on an enlarged scale, ofthe ratchet mechanism.

The frame a of the machine contains a tubular carrier, b, to which a reciprocating movement is imparted, as hereinafter described.

The carrier has at its end a roller-plate, L',

ofthe plate-cams is furnished with fly-wheels. rllhe carrier b has a disk, c, upon it, against which the hereinbefore-described coiled spring f, contained in a spring-box, ax, forming part ot the frame u, abuts. The carrier also at its inner end (or that farthest from the platecams) is enlarged into a box, bx, in which a nut, h, is contained, anda tube, i, with a screwthread upon it, passes through the carrier b from end to end and through the nut L.

Yithin the tubular screw fi the bar j is carrh d in such a manner that it is free only to turn on its axis. ltis formed at one end with a socket, jf, in which the tool jX is clamped, also, beyond the screw t', in the opposite direction, the drill bar j has a colla-1', je, fixed r1`he drill-bar partakes ot the reciprocating motion which the tubular screw 'i receives through the nuthin the box bX at the end ot the carrier. At each reciprocation the end or edge of the tool carried by the drill-bar strikes upon the rock. In the latter part ot' the stroke a trigger, k, mounted upon the 1arrier upon the side ofthe nut-box bx, comesinto contact with a stationary tappet, l, upon the frame a. The trigger then gives movement to a ring, m, through a link, 711/, in the direction the ring m carrying a pawl, 1t, engaging with a ring of ratchet teeth, o, upon the nut h. A spring, s, connected with the pawl-ring, brings this ring back in the direction ot' the upper arrow during the return-stroke ot' the machine and turns the nut, thereby advancing the hollow screw i, the bar j, and the drill jx. The amount ot' the advance depends upon the distance the drill penetrated at the last impact, for the trigger is operated upon only in the latter part of the stroke, and if the stroke is brought to an early conclusion by the resista-nce of the rock the trigger is moved but little or not at all. rlhe screw t' is prevented from turning with the nut h by a feather or tooth, b2, in the disk z, against which the spring j' abuts. I t is capable ot' being retracted out of the groove in the screw t'or a purpose to be explained further on. In the interval between the strokes which the drill-barj is thus caused to make against the face ofthe rock it is necessary that the drill-bar should be turned partly round, so that the edge ot' the drill or tooljX may not always strike in the same place. rlhis is etiected by means of a beveled pinion, p, upon the head of the barj engaging with another similar pinion, Q, upon the same axis,

IOO

is kept disengaged.

g, as that of a ratchet-wheel, q2. The edge of the cam-plate e is itself made into a cam at ex, as the drawings show, and it operates to move a bell-crank lever, r, driving by means of a pawl, s", this ratchet q2, and beveled gearing. This pawl s maybe held to its engagement with the ratchet q2 by any ordinary means-as, for instance, by a boX, or strap, or spring, y, or any simple equivalent device. When it is required to disengage the pawl s* from the ratchet, the pawl is pulled down so that the flat part z" o1" said pawl (see Fig. 6) is caused to bear upon the spring y, whereby the pawl This operation of turning the drill partly round at each stroke is, however, effected in a more simple manner by means of the arrangement shown in elevation atFig. 5, Sheet 2, ofthe accompanying drawings, and which is the arrangement we prefer employing. This arrangement consists of a bar, t, whichismade spiral at one end and is attached to the roller-plate b', thereby participating in the reciprocating motion of the same. The spiral end of this bar runs through a correspondin g spiral hole in the pinion c, and thereby the pinion c is turned at each motion. The pinion t, gea-ring with a pinion, @Qwhich is cast on the boss of the beveled pinion p, causes the bar j to turn also at each motion. To prevent the bar t from turning while imparting motion to the pinion n, a ratchetwheel, fw, and pawl are fixed at the lower end of the bar, allowing it to turn only on the return-stroke. When the hole in the rock has been drilled t'o the full depth required, the drill-bar j has to be run back out ofthe hole, and to effect this conveniently the drill-bar is connected with the screw z', through which it passes, by means of a catch, x', provided for this purpose, engaging in a notch in the socket j', (which socket is a continuous part of the drill-bar,)

and the screw t' and drill-barj will thereby be rml y locked so as to rotate together. At the same time the feather or tooth b2, which prevents the screw turning, is withdrawn by means of its button or head and the drill-bar can be turned by means of a handle applied at its rapidly.

Having thus described the nature of our said invention, what we cla-im is- 1. 1n a rock-perforating machine, in combination with the drillcarrier b and with the drill-bar j, the rotating plate-cam c, having on its face a discon nected seriesofcam-projections, e ,serving to lift the carrier, and having also drill-bar, al1 substantially as shown and de'- scribed. i

2. As a means for partially rotatingthe drillbar,thecombination'oftheliftingcam-plateand its series of peripheral cams e", the bell-crank lever 1', actuated thereby, the ratchet q2, upon a shaft, the pawl s", engaging therewith and "provided with a flat part, z', spring y, adapted to bear against said flat part when the pawl is disengaged, and the gears q and p, these parts co-operating together, substantially as set forth.

' 3. In combination thefollowing elements, namely: the drill-holder and mechanism for rotating it, the feed-screw connected with the drill-holder, a nut engaging said screw and mechanism for rotating it, a spline engaging said screw, and a device for withdrawing it from engagement, and a catch'on the feedscrew engaging a notch in the drill-holder.

M. MAGDERMOTT. W. GLOVER. Witnesses:

A. ALBU'rT, F. PRICE.

upper end, and the tool can be thus withdrawn a series of edgecams, c", serving to turn the 

